Pump base



FIG. 1 is a front perspective view of a pump base having portions shownin phantom;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear view thereof.

The elements shown in phantom form no part of the claimed design. Therear view of the pump base is the same as the rear view of the assembledpump base and pump and therefore is not separately illustrated.

CLAIM The ornamental design for a pump base, as shown and described. 